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16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
16802 engine cooling system
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16802 engine cooling system

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  • 1. ENGINE COOLING SYSTEM
  • 2. Purpose Keep engine at its most efficient temperature In combustion process the temperature of gases is 2200°c Coming to walls of cylinder it is 180 - 260°c This temperature should maintain More heat should not absorb by cooling. up to 35% of heat
  • 3. Types of Cooling Air cooling Liquid cooling
  • 4. Air cooled Engine Metal fine are extended to cylinder walls Engine exposed to air Shrouds and fans are used in some engines Engines are open not grouped
  • 5. Water Cooled Engines Coolant circulate around cylinder walls It takes the heat by convection process Coefficient of heat transfer is higher in liquids Coolant is a mixture of water and antifreeze. (Normally 40/60 mixture)
  • 6. How it Works: Liquid Cooled Systems - A pressurized closed circulation system
  • 7. Parts of a Liquid Cooling System  Radiator & Pressure Cap  Fan & Belt  Coolant Pump  Water Jackets  Thermostat  Hoses  Coolant
  • 8. Water jackets Open space between outside and inside walls of cylinder The coolant circulates freely around engine hot spots It includes valve seats and guides and upper parts of cylinder where piston and rings slides
  • 9. Water jackets
  • 10. Water pump Impeller type centrifugal pumps Placed at front end of cylinder block and back to radiator It can circulate 28,390 lit of coolant per hour It consist inlet, outlet, impeller, bearings and seals
  • 11. Water Pump
  • 12. Engine Fan To pull air through radiator It improves cooling at slow speeds Four to six blades, shrouds Variable speed fan Flexible blade fan Electric fans
  • 13. Radiator Heat exchanger device It holds large volume coolant in close contact with large amount of air Cores and pipes Inlet tank and sink Down flow and cross flow
  • 14. Expansion tanks Separate plastic reservoir Recovery tank Connected to over flow Coolant in engine is expands…contrasts Surge tank An advantage to the use of an expansion tank is that it eliminates almost all air bubbles from the cooling system. Coolant without bubbles absorbs heat better.
  • 15. Transmission oil coolers
  • 16. Thermostat Thermostatic device Wax pellet 85 to 90°c It is placed at passage from cylinder head to upper tank of radiator
  • 17. Radiator Pressure cap Sealing and pressurizing
  • 18. Anti Freeze Solutions An antifreeze is a chemical additive which lowers the freezing point of a water-based liquid Lowers galvanic corrosion Maintain small viscosity to water methanol (methyl alcohol) propylene glycol 5% additives sodium silicate, disodium phosphate, sodium molybdate, sodium borate, and dextrin dye (commonly a green, red, orange, yellow, or blue fluorescent)
  • 19. Temperature indicator Balancing coil gauge Bimetallic thermostat gauge Indicator light

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